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id="post-info"><h1 class="post-title">React高阶应用</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2019-03-22T16:00:00.000Z" title="发表于 2019-03-23 00:00:00">2019-03-23</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2019-06-02T16:00:00.000Z" title="更新于 2019-06-03 00:00:00">2019-06-03</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/React/">React</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.7k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>6分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="React高阶应用"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="React组件"><a href="#React组件" class="headerlink" title="React组件"></a>React组件</h1><h2 id="组件的优化"><a href="#组件的优化" class="headerlink" title="组件的优化"></a>组件的优化</h2><h3 id="场景一"><a href="#场景一" class="headerlink" title="场景一"></a>场景一</h3><figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 现在我们就两个页面 一个是home页面 访问 路径是<span class="string">&#x27;/&#x27;</span> 一个是demo页面 访问路径是 <span class="string">&#x27;/demo&#x27;</span></span><br><span class="line"><span class="number">2.</span> demo 页面里 我们会有一个计数器的功能 当页面一跳转到 这里的时候 开始起一个定时器 然后累加数目</span><br><span class="line"><span class="number">3.</span> 这个时候 我们离开demo页面 去 home页面  就会报错 </span><br><span class="line"><span class="number">4.</span> 报错原因 是因为我们离开demo的时候 没有停止定时器 他还在走 </span><br><span class="line"><span class="number">5.</span> 所以我们需要在 componentWillUnmount 的时候 停止这个定时器</span><br><span class="line"><span class="number">6.</span> 其实不光定时器 比如网络请求 和 事件监听 在组件销毁的时候我们都必须移除</span><br></pre></td></tr></table></figure>
<figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> React <span class="keyword">from</span> <span class="string">&#x27;react&#x27;</span></span><br><span class="line"><span class="keyword">let</span> timerID </span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Demo</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span></span>&#123;</span><br><span class="line">    state = &#123;</span><br><span class="line">        count:<span class="number">0</span> </span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">//这里我们开启了定时器 但当我们离开这个页面的时候 他还在运行 就会报错</span></span><br><span class="line">    <span class="function"><span class="title">componentDidMount</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">let</span> count1 = <span class="number">0</span></span><br><span class="line">        timerID = <span class="built_in">setInterval</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">            count1++</span><br><span class="line">            <span class="built_in">this</span>.setState(&#123;</span><br><span class="line">                count:count1</span><br><span class="line">            &#125;)</span><br><span class="line">        &#125;, <span class="number">1000</span>);</span><br><span class="line">    &#125;</span><br><span class="line">	<span class="comment">//所以 这里 我们在组件卸载的时候 就要清除这个定时 其他的还有 请求 事件监听</span></span><br><span class="line">    <span class="function"><span class="title">componentWillUnmount</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">clearInterval</span>(timerID)</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span>(</span><br><span class="line">            &lt;div&gt;</span><br><span class="line">                &#123;<span class="built_in">this</span>.state.count&#125;</span><br><span class="line">            &lt;/div&gt;</span><br><span class="line">        )</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> Demo</span><br></pre></td></tr></table></figure>
<h3 id="场景二"><a href="#场景二" class="headerlink" title="场景二"></a>场景二</h3><figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 通过刚刚计时器我们知道 由于state的改变  我们视图每次都会重新渲染 而重新渲染就会调用 render函数</span><br><span class="line"><span class="number">2.</span> 如果这个时候 我们当前文件里还有子组件 那么由于state的改变 子组件也会重新渲染 render 也会被执行</span><br><span class="line"><span class="number">3.</span> 但是我们的子组件 是静态的数据 不会改变的时候 这个时候 就有一些不太合理</span><br></pre></td></tr></table></figure>
<p><img src="9.gif" alt=""></p>
<figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//这个时候 我们组要在子组件的 shouldComponentUpdate return false 就是不更新</span></span><br><span class="line"><span class="keyword">import</span> React <span class="keyword">from</span> <span class="string">&#x27;react&#x27;</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="class"><span class="keyword">class</span> <span class="title">Parent</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span></span>&#123;</span><br><span class="line">    <span class="comment">//在这个生命周期函数里 选择 子组件不更新</span></span><br><span class="line">    <span class="function"><span class="title">shouldComponentUpdate</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">&#x27;子组件的render&#x27;</span>)</span><br><span class="line">        <span class="keyword">return</span> (</span><br><span class="line">            &lt;div&gt;</span><br><span class="line">                我是子组件</span><br><span class="line">            &lt;/div&gt;</span><br><span class="line">        )</span><br><span class="line">    &#125;</span><br><span class="line">&#125; </span><br></pre></td></tr></table></figure>
<p><img src="10.gif" alt=""></p>
<h3 id="场景三"><a href="#场景三" class="headerlink" title="场景三"></a>场景三</h3><figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> <span class="class"><span class="keyword">class</span> <span class="title">Child</span> <span class="title">extend</span> <span class="title">React</span>.<span class="title">Component</span> 和 <span class="title">class</span> <span class="title">Child</span> <span class="title">extend</span> <span class="title">React</span>.<span class="title">PureComponent</span> 的区别</span></span><br><span class="line"><span class="class">2. <span class="title">Component</span> 不会对数据进行比较 <span class="title">PureComponent</span> 会对数据进行浅比较 </span></span><br><span class="line"><span class="class">3. 就是 使用了 <span class="title">PureComponent</span> 的组件 你如果这次跟给我上次传过来的值 相同 我就不会 更新</span></span><br></pre></td></tr></table></figure>
<h3 id="Context-的使用"><a href="#Context-的使用" class="headerlink" title="Context  的使用"></a>Context  的使用</h3><figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 比如我们现在 A 组件里 有B组件  B组件里有C组件 </span><br><span class="line"><span class="number">2.</span> 我们现在 有一个参数 从A 传到 B 了 但是B组件中没有使用 只有在C组件中使用</span><br><span class="line"><span class="number">3.</span> 以前的做法 我们就是 从A传到B  然后 B在传给C</span><br><span class="line"><span class="number">4.</span> 这个时候 我们就可以用 Context去完成</span><br></pre></td></tr></table></figure>
<figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> React <span class="keyword">from</span> <span class="string">&#x27;react&#x27;</span></span><br><span class="line"><span class="keyword">import</span> PropTypes <span class="keyword">from</span> <span class="string">&#x27;prop-types&#x27;</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Bcom</span> (<span class="params">props</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span>(</span><br><span class="line">        &lt;&gt;</span><br><span class="line">        &lt;div&gt;我是在demo1组件里的B组件&lt;/div&gt;</span><br><span class="line">        &lt;Ccom /&gt;</span><br><span class="line">        &lt;/&gt;</span><br><span class="line">    )</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Ccom</span> (<span class="params">props,context</span>)</span>&#123;</span><br><span class="line">    <span class="number">3.</span>这样我就可以拿到 context里面的东西了</span><br><span class="line">    <span class="built_in">console</span>.log(context,<span class="string">&#x27;---context&#x27;</span>)</span><br><span class="line">    <span class="keyword">return</span>(</span><br><span class="line">        &lt;div&gt;我是在B组件里的C组件</span><br><span class="line">            我是context:&#123;context.color&#125;</span><br><span class="line">        &lt;/div&gt;</span><br><span class="line">    )</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="class"><span class="keyword">class</span> <span class="title">Demo</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span></span>&#123;</span><br><span class="line">    <span class="number">1.</span>我们要把这个传递的属性 挂到 context 上</span><br><span class="line">    <span class="function"><span class="title">getChildContext</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span>&#123;</span><br><span class="line">            color:<span class="string">&#x27;red&#x27;</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span> (</span><br><span class="line">            &lt;div&gt;</span><br><span class="line">                我是demo1</span><br><span class="line">                &lt;Bcom /&gt;</span><br><span class="line">            &lt;/div&gt;</span><br><span class="line">        )</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="number">2.</span>对 挂载到context 上的 属性的值 进行类型的类型的生命</span><br><span class="line">Ccom.contextTypes = &#123;</span><br><span class="line">    color:PropTypes.string</span><br><span class="line">&#125;</span><br><span class="line">Demo.childContextTypes = &#123;</span><br><span class="line">    color:PropTypes.string</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="高阶组件"><a href="#高阶组件" class="headerlink" title="高阶组件"></a>高阶组件</h2><figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 高阶组件简称叫HOC  是一个函数 参数是一个组件  返回值是一个组件</span><br><span class="line"><span class="number">2.</span> 高阶组件 做了什么事情 比如 我们的react-router-dom 里的 withRouter 把我们的组件 包裹了起来 然后返回了一个组件 这个组件的属性上 就有了 路由的那些API 比如 push  location之类的</span><br><span class="line">https:<span class="comment">//pan.baidu.com/s/1bNhFxu2MgnGC_YKnpuP-Cg dhi8</span></span><br></pre></td></tr></table></figure>
<figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="keyword">import</span> React <span class="keyword">from</span> <span class="string">&#x27;react&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//1.定义一个高阶组件 他是一个函数 参数 是一个组件 返回值 是一个组件</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> withfetch = <span class="function">(<span class="params">ComposeComponent</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="comment">//返回值 是一个组件 里面渲染我们的传进来的组件</span></span><br><span class="line">    <span class="comment">//5.由于 我们给我们的高阶组件传递了参数 所以在这里 我们就能做一些事情  比如withRouter就把push方法挂载到这上面了</span></span><br><span class="line">    <span class="comment">//然后通过下面的形式把参数继续传递下去</span></span><br><span class="line">    <span class="keyword">return</span> <span class="class"><span class="keyword">class</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span></span>&#123;</span><br><span class="line">        <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">            <span class="keyword">return</span>(</span><br><span class="line">                &lt;ComposeComponent &#123;...this.props&#125;/&gt;</span><br><span class="line">            )</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 2.我们现在有定义了一个组件 现在里面有个data参数 是从父组件传进来的 现在用我们上面的高阶组件包装一下</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Mydata</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span></span>&#123;</span><br><span class="line">    <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span>(</span><br><span class="line">            &lt;div&gt;</span><br><span class="line">                &#123;<span class="comment">/* 6. 这里我们就可以拿到父组件传递给高阶组件的数据  */</span>&#125;</span><br><span class="line">                mydata:&#123;<span class="built_in">this</span>.props.data&#125;</span><br><span class="line">            &lt;/div&gt;</span><br><span class="line">        )</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 3. 那么现在 Withfetch 就是一个高阶组件了</span></span><br><span class="line"><span class="keyword">const</span> Withfetch = withfetch(Mydata)</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Child</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span></span>&#123;</span><br><span class="line">    <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span>(</span><br><span class="line">            &lt;div&gt;</span><br><span class="line">                &lt;div&gt;高阶组件&lt;/div&gt;</span><br><span class="line">                &#123;<span class="comment">/* 4.我们现在渲染这个高阶组件了 并给他传入了参数 */</span>&#125;</span><br><span class="line">                &lt;Withfetch data=&#123;<span class="string">&#x27;我是外层传进来的数据&#x27;</span>&#125; /&gt;</span><br><span class="line">            &lt;/div&gt;</span><br><span class="line">        )</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> Child</span><br></pre></td></tr></table></figure>
<h3 id="应用"><a href="#应用" class="headerlink" title="应用"></a>应用</h3><figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 比如我们现在有这样么一个场景 都是去请求数据 然后去渲染列表 </span><br><span class="line"><span class="number">2.</span> 唯一的区别 只不过 渲染列表的结构 不一样 请求的URL地址不一样</span><br><span class="line"><span class="number">3.</span> 这里 我们就可以写一个高阶组件 公共的方法就是 去统一的去发送请求 然后处理loading 然后 渲染列表</span><br></pre></td></tr></table></figure>
<figure class="highlight jsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> React <span class="keyword">from</span> <span class="string">&#x27;react&#x27;</span></span><br><span class="line"><span class="comment">//假装这是一个请求</span></span><br><span class="line"><span class="keyword">const</span> fetch = <span class="function">() =&gt;</span> &#123;&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//1.写一个高阶组件函数 第一个是传进去url地址</span></span><br><span class="line"><span class="keyword">const</span> withFetch = <span class="function">(<span class="params">url</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="comment">//2.第二个参数 是 传进去的组件 或者结构</span></span><br><span class="line">    <span class="keyword">return</span> <span class="function">(<span class="params">ComseComponent</span>) =&gt;</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="class"><span class="keyword">class</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span></span>&#123;</span><br><span class="line">            <span class="function"><span class="title">constructor</span>(<span class="params">props</span>)</span>&#123;</span><br><span class="line">                <span class="built_in">super</span>(props)</span><br><span class="line">                <span class="built_in">this</span>.state = &#123;</span><br><span class="line">                    loading:<span class="literal">true</span>,</span><br><span class="line">                    data:<span class="string">&#x27;&#x27;</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">async</span> <span class="function"><span class="title">componentDidMount</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                <span class="comment">// const data = await fetch(url)</span></span><br><span class="line">                <span class="built_in">console</span>.log(url)</span><br><span class="line">                <span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">                    <span class="built_in">this</span>.setState(&#123;</span><br><span class="line">                        loading:<span class="literal">false</span>,</span><br><span class="line">                        data:<span class="string">&#x27;我是传进来的数据&#x27;</span></span><br><span class="line">                    &#125;)</span><br><span class="line">                &#125;,<span class="number">2000</span>)</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">            <span class="keyword">return</span>(</span><br><span class="line">            &#123;<span class="comment">/*  这里 我们ComseComponent 就是我们的chengpin里传进来的 函数式组件 */</span>&#125;</span><br><span class="line">            <span class="built_in">this</span>.state.loading?<span class="xml"><span class="tag">&lt;<span class="name">div</span>&gt;</span>正在请求数据...<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span>:<span class="xml"><span class="tag">&lt;<span class="name">ComseComponent</span> <span class="attr">data</span>=<span class="string">&#123;this.state.data&#125;/</span>&gt;</span></span></span><br><span class="line">            )</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//调用 传进去一个函数式组件 这里我们就可以根据不同的情况 传进去不同的组件结构 然后去渲染列表了</span></span><br><span class="line"><span class="keyword">const</span> Chengpin = withFetch(<span class="string">&#x27;htt://www.baidu.com&#x27;</span>)(<span class="function">(<span class="params">props</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">return</span>(</span><br><span class="line">        &lt;div&gt;&#123;props.data&#125;&lt;/div&gt;</span><br><span class="line">    )</span><br><span class="line">&#125;)</span><br><span class="line"><span class="comment">//导出 即用即可</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> Chengpin</span><br><span class="line"><span class="comment">// 如果 我们还有 更多的 这样的方法 用这一个高阶组件包装一下 就特别好用</span></span><br></pre></td></tr></table></figure>
</article><div class="post-copyright"><div class="post-copyright__title"><span class="post-copyright-info"><h>React高阶应用</h></span></div><div class="post-copyright__type"><span class="post-copyright-info"><a href="http://example.com/2019/03/23/React%E7%BB%84%E4%BB%B6%E7%AF%87/">http://example.com/2019/03/23/React%E7%BB%84%E4%BB%B6%E7%AF%87/</a></span></div><div class="post-copyright-m"><div class="post-copyright-m-info"><div class="post-copyright-a"><h>作者</h><div class="post-copyright-cc-info"><h>北城韩雨</h></div></div><div class="post-copyright-c"><h>发布于</h><div class="post-copyright-cc-info"><h>2019-03-23</h></div></div><div class="post-copyright-u"><h>更新于</h><div class="post-copyright-cc-info"><h>2019-06-03</h></div></div><div class="post-copyright-c"><h>许可协议</h><div class="post-copyright-cc-info"><a class="icon" rel="noopener" target="_blank" title="Creative Commons" href="https://creativecommons.org/"><i class="fab fa-creative-commons"></i></a><a rel="noopener" target="_blank" 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src="https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fcz-video-photo.oss-cn-beijing.aliyuncs.com%2F20191017%2F4cfc341591d242327b67e9ceb6953612_00002.jpg&refer=http%3A%2F%2Fcz-video-photo.oss-cn-beijing.aliyuncs.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1629530702&t=80943e12d5239f63beafd6d1c540855f" alt="cover"><div class="content is-center"><div class="date"><i class="far fa-calendar-alt fa-fw"></i> 2019-03-24</div><div class="title">webAPP 美食项目</div></div></a></div><div><a href="/2019/03/22/React基础/" title="React基础"><img class="cover" src="https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fcz-video-photo.oss-cn-beijing.aliyuncs.com%2F20191017%2F4cfc341591d242327b67e9ceb6953612_00002.jpg&refer=http%3A%2F%2Fcz-video-photo.oss-cn-beijing.aliyuncs.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1629530702&t=80943e12d5239f63beafd6d1c540855f" alt="cover"><div class="content is-center"><div class="date"><i class="far fa-calendar-alt fa-fw"></i> 2019-03-22</div><div class="title">React基础</div></div></a></div></div></div></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="/img/my.jpg" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">北城韩雨</div><div class="author-info__description">一个前端界的小学生</div></div><div class="card-info-data"><div class="card-info-data-item is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">65</div></a></div><div class="card-info-data-item is-center"><a href="/tags/"><div class="headline">标签</div><div class="length-num">23</div></a></div><div class="card-info-data-item is-center"><a href="/categories/"><div class="headline">分类</div><div class="length-num">21</div></a></div></div><a class="button--animated" id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/wazer1987"><i class="fab 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class="toc-text">React组件</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E7%BB%84%E4%BB%B6%E7%9A%84%E4%BC%98%E5%8C%96"><span class="toc-text">组件的优化</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%9C%BA%E6%99%AF%E4%B8%80"><span class="toc-text">场景一</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%9C%BA%E6%99%AF%E4%BA%8C"><span class="toc-text">场景二</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%9C%BA%E6%99%AF%E4%B8%89"><span class="toc-text">场景三</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Context-%E7%9A%84%E4%BD%BF%E7%94%A8"><span class="toc-text">Context  的使用</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E9%AB%98%E9%98%B6%E7%BB%84%E4%BB%B6"><span class="toc-text">高阶组件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" 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